The dangers of knives and gangs should be taught to primary school children, according to the Government’s victim commissioner.

Baroness Newlove’s husband Gary was murdered in August 2007 by a gang of three youths when he was 47.

The commissioner has now warned that children as young as seven are at risk of being involved in gangs.

"But no child is born with a knife in its hand,” Baroness told the Daily Telegraph. “We must do something in the intervening years before it becomes the essential accessory."

Baroness, who has been the victim’s commissioner since 2012, said technology firms should also be blamed for violent music on their websites.

Cressida Dick, the Met’s Police Commissioner, has already called on YouTube to remove videos that glamorise violence.

A spokeswoman for YouTube said in August: "Along with others in the UK, we share the deep concern about this issue and do not want our platform used to incite violence."

Youngsters in Bellingham, Anerley and Clapham have been stabbed to death in a tragic couple of weeks in south London.

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A 16-year-old girl was arrested on Friday (November 9) after the murder of Ayodeji Habeeb Azeez, 22, who was killed in Samos Road in Anerley on November 4.

This was just three days after Jay Hughes, 15, was also fatally stabbed outside a chicken shop on Randlesdown Road in Bellingham on November 1.

Just a day later (November 2), Malcolm Mide-Madariol, 17, was stabbed in Balham Hill near Clapham South underground station before later dying in hospital.